If you want old fashioned, "Fare thee well" would work well. If you really want to get fancy, you could say something like, "Blessings upon thy household 'til we again meet", Blessings upon thee until again we meet", or simply, "Blessings upon thee and thine." There are numerous options one could use, such as Adding the possessive form of the name of a deity before "blessings", such as "God's blessings" or, even more formal, such as, "The blessings of God upon thee until again we should meet." You can also play with various combinations of these suggestions.
(Btw, I used to work Renaissance Festivals portraying a "feisty" disenfranchised Irish Noblewoman.)
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